[tor-bugs] #33045 [Core Tor/Tor]: Increase the number of Tor network relays that support IPv6

[Tor Bug Tracker & Wiki]

#33045: Increase the number of Tor network relays that support IPv6
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     Reporter:  gaba          |      Owner:  (none)
         Type:  project       |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:  Sponsor55     |
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 By the numbers, about 29% of Tor’s relay bandwidth supports IPv6--but
 functionally, only 20% of Tor’s available bandwidth supports IPv6. This is
 because some Guard relays are also Exit relays, and as such, they are only
 used as Exits by Tor clients. These limitations mean that even if an Exit
 relay supports IPv6, it doesn’t functionally increase the Tor network’s
 client to Guard IPv6 bandwidth.

 In order to better support IPv6, we aim to increase the client to Guard
 relay bandwidth that supports IPv6 to 33%. Reaching this goal (and
 completing this project) is the first step in a longer-term effort to
 implement “fast fallback,” which will make sure that Tor clients first try
 IPv4 and then try IPv6 after a short delay, using whichever option works.

 To increase the functional relay bandwidth that supports IPv6, we need to
 improve the way we handle configuration for dual stack Tor relays (relays
 that support both IPv4 and IPv6). As it stands, dual stack relays require
 some manual configuration, which can be a setup barrier for relay
 operators. Automating relay IPv6 address discovery and reachability checks
 will help operators to run more dual stack relays more easily and, over
 time, increase the number of relays that support IPv6.

 More information about this project at
 https://trac.torproject.org/projects/tor/wiki/org/sponsors/Sponsor55

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33045>
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